- FindStat

Identifier

Mp00031: Dyck paths —to 312-avoiding permutation⟶ Permutations
St000366: Permutations ⟶ ℤ

Values

[1,0] => [1] => 0

[1,0,1,0] => [1,2] => 0

[1,1,0,0] => [2,1] => 0

[1,0,1,0,1,0] => [1,2,3] => 0

[1,0,1,1,0,0] => [1,3,2] => 0

[1,1,0,0,1,0] => [2,1,3] => 0

[1,1,0,1,0,0] => [2,3,1] => 0

[1,1,1,0,0,0] => [3,2,1] => 1

[1,0,1,0,1,0,1,0] => [1,2,3,4] => 0

[1,0,1,0,1,1,0,0] => [1,2,4,3] => 0

[1,0,1,1,0,0,1,0] => [1,3,2,4] => 0

[1,0,1,1,0,1,0,0] => [1,3,4,2] => 0

[1,0,1,1,1,0,0,0] => [1,4,3,2] => 1

[1,1,0,0,1,0,1,0] => [2,1,3,4] => 0

[1,1,0,0,1,1,0,0] => [2,1,4,3] => 0

[1,1,0,1,0,0,1,0] => [2,3,1,4] => 0

[1,1,0,1,0,1,0,0] => [2,3,4,1] => 0

[1,1,0,1,1,0,0,0] => [2,4,3,1] => 1

[1,1,1,0,0,0,1,0] => [3,2,1,4] => 1

[1,1,1,0,0,1,0,0] => [3,2,4,1] => 0

[1,1,1,0,1,0,0,0] => [3,4,2,1] => 1

[1,1,1,1,0,0,0,0] => [4,3,2,1] => 2

[1,0,1,0,1,0,1,0,1,0] => [1,2,3,4,5] => 0

[1,0,1,0,1,0,1,1,0,0] => [1,2,3,5,4] => 0

[1,0,1,0,1,1,0,0,1,0] => [1,2,4,3,5] => 0

[1,0,1,0,1,1,0,1,0,0] => [1,2,4,5,3] => 0

[1,0,1,0,1,1,1,0,0,0] => [1,2,5,4,3] => 1

[1,0,1,1,0,0,1,0,1,0] => [1,3,2,4,5] => 0

[1,0,1,1,0,0,1,1,0,0] => [1,3,2,5,4] => 0

[1,0,1,1,0,1,0,0,1,0] => [1,3,4,2,5] => 0

[1,0,1,1,0,1,0,1,0,0] => [1,3,4,5,2] => 0

[1,0,1,1,0,1,1,0,0,0] => [1,3,5,4,2] => 1

[1,0,1,1,1,0,0,0,1,0] => [1,4,3,2,5] => 1

[1,0,1,1,1,0,0,1,0,0] => [1,4,3,5,2] => 0

[1,0,1,1,1,0,1,0,0,0] => [1,4,5,3,2] => 1

[1,0,1,1,1,1,0,0,0,0] => [1,5,4,3,2] => 2

[1,1,0,0,1,0,1,0,1,0] => [2,1,3,4,5] => 0

[1,1,0,0,1,0,1,1,0,0] => [2,1,3,5,4] => 0

[1,1,0,0,1,1,0,0,1,0] => [2,1,4,3,5] => 0

[1,1,0,0,1,1,0,1,0,0] => [2,1,4,5,3] => 0

[1,1,0,0,1,1,1,0,0,0] => [2,1,5,4,3] => 1

[1,1,0,1,0,0,1,0,1,0] => [2,3,1,4,5] => 0

[1,1,0,1,0,0,1,1,0,0] => [2,3,1,5,4] => 0

[1,1,0,1,0,1,0,0,1,0] => [2,3,4,1,5] => 0

[1,1,0,1,0,1,0,1,0,0] => [2,3,4,5,1] => 0

[1,1,0,1,0,1,1,0,0,0] => [2,3,5,4,1] => 1

[1,1,0,1,1,0,0,0,1,0] => [2,4,3,1,5] => 1

[1,1,0,1,1,0,0,1,0,0] => [2,4,3,5,1] => 0

[1,1,0,1,1,0,1,0,0,0] => [2,4,5,3,1] => 1

[1,1,0,1,1,1,0,0,0,0] => [2,5,4,3,1] => 2

[1,1,1,0,0,0,1,0,1,0] => [3,2,1,4,5] => 1

[1,1,1,0,0,0,1,1,0,0] => [3,2,1,5,4] => 1

[1,1,1,0,0,1,0,0,1,0] => [3,2,4,1,5] => 0

[1,1,1,0,0,1,0,1,0,0] => [3,2,4,5,1] => 0

[1,1,1,0,0,1,1,0,0,0] => [3,2,5,4,1] => 1

[1,1,1,0,1,0,0,0,1,0] => [3,4,2,1,5] => 1

[1,1,1,0,1,0,0,1,0,0] => [3,4,2,5,1] => 0

[1,1,1,0,1,0,1,0,0,0] => [3,4,5,2,1] => 1

[1,1,1,0,1,1,0,0,0,0] => [3,5,4,2,1] => 2

[1,1,1,1,0,0,0,0,1,0] => [4,3,2,1,5] => 2

[1,1,1,1,0,0,0,1,0,0] => [4,3,2,5,1] => 1

[1,1,1,1,0,0,1,0,0,0] => [4,3,5,2,1] => 1

[1,1,1,1,0,1,0,0,0,0] => [4,5,3,2,1] => 2

[1,1,1,1,1,0,0,0,0,0] => [5,4,3,2,1] => 3

[1,0,1,0,1,0,1,0,1,0,1,0] => [1,2,3,4,5,6] => 0

[1,0,1,0,1,0,1,0,1,1,0,0] => [1,2,3,4,6,5] => 0

[1,0,1,0,1,0,1,1,0,0,1,0] => [1,2,3,5,4,6] => 0

[1,0,1,0,1,0,1,1,0,1,0,0] => [1,2,3,5,6,4] => 0

[1,0,1,0,1,0,1,1,1,0,0,0] => [1,2,3,6,5,4] => 1

[1,0,1,0,1,1,0,0,1,0,1,0] => [1,2,4,3,5,6] => 0

[1,0,1,0,1,1,0,0,1,1,0,0] => [1,2,4,3,6,5] => 0

[1,0,1,0,1,1,0,1,0,0,1,0] => [1,2,4,5,3,6] => 0

[1,0,1,0,1,1,0,1,0,1,0,0] => [1,2,4,5,6,3] => 0

[1,0,1,0,1,1,0,1,1,0,0,0] => [1,2,4,6,5,3] => 1

[1,0,1,0,1,1,1,0,0,0,1,0] => [1,2,5,4,3,6] => 1

[1,0,1,0,1,1,1,0,0,1,0,0] => [1,2,5,4,6,3] => 0

[1,0,1,0,1,1,1,0,1,0,0,0] => [1,2,5,6,4,3] => 1

[1,0,1,0,1,1,1,1,0,0,0,0] => [1,2,6,5,4,3] => 2

[1,0,1,1,0,0,1,0,1,0,1,0] => [1,3,2,4,5,6] => 0

[1,0,1,1,0,0,1,0,1,1,0,0] => [1,3,2,4,6,5] => 0

[1,0,1,1,0,0,1,1,0,0,1,0] => [1,3,2,5,4,6] => 0

[1,0,1,1,0,0,1,1,0,1,0,0] => [1,3,2,5,6,4] => 0

[1,0,1,1,0,0,1,1,1,0,0,0] => [1,3,2,6,5,4] => 1

[1,0,1,1,0,1,0,0,1,0,1,0] => [1,3,4,2,5,6] => 0

[1,0,1,1,0,1,0,0,1,1,0,0] => [1,3,4,2,6,5] => 0

[1,0,1,1,0,1,0,1,0,0,1,0] => [1,3,4,5,2,6] => 0

[1,0,1,1,0,1,0,1,0,1,0,0] => [1,3,4,5,6,2] => 0

[1,0,1,1,0,1,0,1,1,0,0,0] => [1,3,4,6,5,2] => 1

[1,0,1,1,0,1,1,0,0,0,1,0] => [1,3,5,4,2,6] => 1

[1,0,1,1,0,1,1,0,0,1,0,0] => [1,3,5,4,6,2] => 0

[1,0,1,1,0,1,1,0,1,0,0,0] => [1,3,5,6,4,2] => 1

[1,0,1,1,0,1,1,1,0,0,0,0] => [1,3,6,5,4,2] => 2

[1,0,1,1,1,0,0,0,1,0,1,0] => [1,4,3,2,5,6] => 1

[1,0,1,1,1,0,0,0,1,1,0,0] => [1,4,3,2,6,5] => 1

[1,0,1,1,1,0,0,1,0,0,1,0] => [1,4,3,5,2,6] => 0

[1,0,1,1,1,0,0,1,0,1,0,0] => [1,4,3,5,6,2] => 0

[1,0,1,1,1,0,0,1,1,0,0,0] => [1,4,3,6,5,2] => 1

[1,0,1,1,1,0,1,0,0,0,1,0] => [1,4,5,3,2,6] => 1

[1,0,1,1,1,0,1,0,0,1,0,0] => [1,4,5,3,6,2] => 0

[1,0,1,1,1,0,1,0,1,0,0,0] => [1,4,5,6,3,2] => 1

[1,0,1,1,1,0,1,1,0,0,0,0] => [1,4,6,5,3,2] => 2

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$F_{1} = 1$

$F_{2} = 2$

$F_{3} = 4 + q$

$F_{4} = 9 + 4\ q + q^{2}$

$F_{5} = 21 + 15\ q + 5\ q^{2} + q^{3}$

$F_{6} = 51 + 50\ q + 24\ q^{2} + 6\ q^{3} + q^{4}$

Description

The number of double descents of a permutation.
A double descent of a permutation

$\pi$ is a position

$i$ such that

$\pi(i) > \pi(i+1) > \pi(i+2)$ .

Map

to 312-avoiding permutation

Description

Sends a Dyck path to the 312-avoiding permutation according to Bandlow-Killpatrick.
This map is defined in [1] and sends the area (St000012The area of a Dyck path.) to the inversion number (St000018The number of inversions of a permutation.).